Features

Stereo input and output
Dedicated 192 kHz / 24-bit high-quality Burr-Brown DAC
Dedicated 192 kHz / 24-bit high-quality Burr-Brown ADC
Hardware volume control for DAC. The output volume can be controlled using “alsamixer” or any application that supports ALSA mixer controls.
Connects directly onto the Raspberry Pi.
No soldering required.
Compatible with all Raspberry Pi models, that have a 40-pin GPIO connector
No additional power supply required.
Three ultra-low-noise linear voltage regulators.
HAT compliant, EEPROM for automatic configuration.
Gold plated RCA output connectors.
Includes 4 M 2.5 x 12 mm spacers.

HiFiBerry DAC + ADC Layout

Analogue input, phone jack 3.5 mm
Analogue output RCA
Analogue output (P5)
Input configuration jumper (J1)
Connector for balanced input (P6)

Please note: Layout and components might change without further notice.

Balanced/unbalanced input connector (P6)

The 5-pin connector can be used to connect a balanced input. Please note that the balanced input has to be selected with the jumpers and will always have a 12 dB gain. It shouldn't be used with line-level inputs.

Pin 1 is on the left.

right +
right –
GND
left –
left +

Output connector (P5)

The output connector realizes connections to external components like an amplifier.

Pin 1 is on the top left.

+5V	1	2	R
GND	3	4	GND
+5V	5	6	L

Input gain settings (J1)

The jumper block is responsible for the input configuration. It is recommended to use the default setting without additional input gain. 32 dB gain can be used to connect dynamic microphones.

Jumpers are numbered from top to bottom.

1	2	3	4	function
1	0	0	–	0 dB gain
0	1	1	–	12 dB gain
0	1	0	–	32 dB gain
0	0	1	–	balanced input, 12 dB gain

Specifications

Maximum input voltage: 2.1 Vrms - 4.2 Vrms for balanced input
Maximum output voltage: 2.1 Vrms
ADC signal-to-noise ratio: 110 dB
DAC signal-to-noise ratio: 112 dB
ADC THD+N: -93 dB
DAC THD+N: -93 dB
Input voltage for lowest distortions: 0.8 Vrms
Input gain (configurable with Jumpers): 0 dB, 12 dB, 32 dB
Power consumption: < 0.3 W
Sample rates: 44.1 kHz - 192 kHz

In order to use the HiFiBerry DAC + ADC, your Raspberry Pi Linux kernel must be at least version 4.18.12.
Click here to learn how to update the Raspberry Pi kernel

Using microphones with the DAC+ ADC

The DAC+ ADC is equipped with a stereo analogue input that can be configured for a wide range of input voltages. It performs best with line-level analogue sources. However, it is also possible to use it as a microphone input.

You can only use dynamic microphones. Microphones that require a power supply are not supported.
The microphone output voltage is very low. This means you need to amplify it. The DAC+ ADC has the necessary pre-amplifier already equipped. You will have to set the jumpers correctly.
The sound from the input won’t be played back automatically on the output. You will have to use some software that reads the input and outputs it again.

Setting the correct input amplifier settings for a microphone

By default, the input sensitivity is matched for line-level audio sources. This is done via a jumper on the J1 header.

HiFiBerry DAC+ ADC - input amplifier Default Settings

In order to use a microphone, the jumper needs to be set up as shown below.

HiFiBerry DAC+ ADC - input amplifier Microphone Settings

Audio input to output

There is no direct connection between the input and the output. That leads to the input from the connected microphone to not be played back automatically. If you want to hear it on the output, you need to use the command line tool alsaloop can be used for this.

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